Weird routing problem

[nmessick]

basic config is two locatios, each with two subnets connected with an MPLS.

The remote site routes to the local site just fine, however when doing a tracert from local to remote somthing is not right. The connection does work, however we're getting lots of 1-way audio on VOIP calls.


Local -> Remote

Tracing route to 192.168.3.48 over a maximum of 30 ho

1 <1 ms <1 ms <1 ms 192.168.2.200 (local Fe1)
2 27 ms 27 ms 27 ms 999.20.94.29 (MPLS gateway)
3 28 ms 47 ms 28 ms 999.20.94.213 (MPLS)
4 36 ms 35 ms 35 ms 999.20.94.214 (remote S0)
5 * * * Request timed out.
6 * * * Request timed out.
7 * * * Request timed out.
8 * * * Request timed out.
9 * * * Request timed out.
10 42 ms 41 ms 41 ms 192.168.3.48 (target!)


Remote -> Local

Tracing route to 192.168.4.48 over a maximum of 30 hops

1 <1 ms <1 ms <1 ms 192.168.3.1 (local Fe1)
2 8 ms 8 ms 8 ms 999.20.94.213 (MPLS gateway)
3 9 ms 9 ms 10 ms 999.20.94.29 (mpls)
4 36 ms 36 ms 36 ms 999.20.94.30 (remote S0)
5 57 ms 56 ms 60 ms 192.168.4.48 (target(


Any ideas why the trace route would do this? I don't understand why it works going one way, but not the other.

 

[VinceWhirlwind]

What is "Remote S0"? Is that your own router or is it the MPLS provider's CPE?

It is normal for a traceroute to drop hops on a link which is working perfectly well - if you have some kind of filtering occurring.

More details of the one-way voice might be helpful - which voice in which direction is being affected?
At the same time, give us your jitter buffer settings for each end.

On the whole, it is very uncommon for one-way voice to occur on the network - it is almost always a signalling issue or some problem occurring within the voice server during call setup.
If you think about it logically, if the phones can setup a call between themselves, then they are clearly passing packets to each other.
It should take you about 5 minutes to rule out a jitter-buffer setting set too low or a firewall/access-list blocking rtp in one direction and then you should focus on the management of the call setup process.